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Business Combinations - Summary of Net Assets Acquired and Total Consideration Transferred Business Combinations (Detail) - Acquisitions 2022-2024 [member] - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Consideration Transferred Business Combinations [Line Items] |  |  |
Purchase price paid on acquisition | kr 0 | kr 579 | kr 51,297
Deferred consideration/Others | 0 | 0 | 1,972
Total consideration, all cash and cash equivalents | 0 | 579 | 53,269
Net assets (liabilities) acquired |  |  |
Intangible assets | 0 | 306 | 23,554
Property, plant and equipment | 0 | 1 | 186
Right-of-use of assets | 0 | 2 | 334
Cash and cash equivalents | 0 | 7 | 521
Other assets | 0 | 83 | 5,344
Provisions, incl. post-employment benefits | 0 | 0 | (1,050)
Other liabilities | 0 | (168) | (16,916)
Total identifiable net assets (liabilities) | 0 | 231 | 11,973
Goodwill | 0 | 348 | 41,296
Total | 0 | 579 | 53,269
Acquisition-related costs | kr 0 | kr 36 | kr 436

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